Fig. 4
Expression levels of the identified proteins classified by functional groups and families. The expression level was calculated as the average spectral signal peak area in female (F1, F2, F3) and male (M1, M2, M3) saliva samples. a Comparative expression level between female and male saliva. b, c Pie charts showing the percentage of abundance of each functional group/family in the saliva of females (b) and males (c)